An attorney for Army Sgt. Bowe Bergdahl has sent Donald Trump a request to meet with him "as soon as possible" to discuss the Republican presidential front-runner's public comments about his client.

Bergdahl's defense has lashed out at Trump in the past for remarks such as the one he made at a rally last October, in which he called Bergdahl a "traitor, a no-good traitor, who should have been executed."

On Saturday, Lt. Col. Franklin Rosenblatt sent a letter to Trump asking for time to interview him in order to determine whether he needs to be subpoenaed before a pending court-martial hearing.

"Based on your personal knowledge of matters that are relevant to Sergeant Bergdahl's right to a fair trial, this interview will help us determine whether to seek a deposition order ... or your personal appearance as a witness at an Article 39(a) session of the court-martial," Rosenblatt wrote in the letter, which was obtained by NBC News.

He asked for a response "as soon as possible," and assured the busy candidate, "I assume the interview will last less than two hours. I will try to keep it as short as possible."

Pfc. Bowe Bergdahl before his capture by the Taliban in Afghanistan. Bergdahl had gone missing from his post in Afghanistan on June 30, 2009.U.S. Army via AFP - Getty Images file

Bergdahl, 29, of Hailey, Idaho, walked away from his post in Afghanistan in June 2009. He was captured by the Taliban and held for five years before he was freed in a controversial prisoner swap for five Taliban detainees at Guantanamo Bay.